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DGP01448AAA
GSS7725 Interference Generator User Manual
© Spirent Communications plc 2002-2017
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Chapter 7: Calibration
The GSS7725 controller contains calibration files that match the GSS7725. This chapter describes
the files and their location.
There are three csv files in
C:\Windows\System32\config\systemprofile\AppData\Roaming\.uhd\cal\
that hold IQ calibration data.
Figure 15 IQ calibration files
The file name includes the serial number of the GSS7725
There is another calibration file
CalibrationTable_UsrpEthAtt.csv
that holds output level data that
can be found in
C:\Program Files\Spirent Communications\Positioning Applications\GSS7725\etc
The GSS7725 controller contains the software and drivers required to calibrate the GSS7725
7.1 Equipment required
GSS7725
Connected to GSS7725 controller PC with Ethernet
GSS7725 controller
GSS7725 controller
Keyboard, mouse and monitor
Connected to GSS7725 controller PC
Power supply
Power brick that comes with GSS7725
Ethernet cable
Ethernet cable that comes with GSS7725
Power meter
Agilent power meter type 'E4418B' or 'N1913A'
directly connected to the front RF output of the
GSS7725
USB to GPIB adaptor
Available from National Instruments connected from a
controller USB port to the power meter GPIB port
7.2 Testing the output level
In explorer navigate to the following directory:
C:\Program Files\Spirent Communications\Positioning Applications\GSS7725\etc
Run the following command as administrator:
Calibrate_test.bat
A script will now run to test the GSS7725 output level. At each frequency the power output of the
GSS7725 will be read from the power meter. The power, if calibrated correctly should be -20dBm +/-
1dB. If all values are within -20dBm +/- 1dB the screen will show “PASS”. The script takes about 20
minutes to complete
